## Statistics (12th Edition)

Fail to reject Null Hypothesis. Hence there is no sufficient evidence that $µ_{1} - µ_{2} \ne 5$
$z = \frac{70-50-5}{\sqrt {100/100 + 64/100}}$ $= \frac{15}{1.64} = 9.146$ Since 9.146 > 1.96, we fail to reject Null Hypothesis